ICP Control Board Kit for RHS183L0CA0AAAA — 24V Defrost Board | Ships Today

Overview

This OEM Control Board Kit (part number 1183618) is the brain of your ICP / Tempstar / Heil RHS183L0CA0AAAA heat pump. The defrost control board manages the 24V control circuit, coordinates the compressor contactor, reversing valve, and outdoor fan, and runs the timed defrost sequence that keeps the outdoor coil free of ice in heating mode. When this board fails, the system loses its ability to switch between heating and cooling cleanly or to clear frost — leaving you with a unit that ices over, short cycles, or simply will not energize the compressor. Replacing the board with the exact OEM kit restores factory logic and timing.

Specifications

Compatibility

Engineered specifically for the ICP family RHS183L0CA0AAAA heat pump and shared chassis units sold under the Tempstar, Heil, and Comfortmaker brands. Always match the OEM part number stamped on your existing board before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the outdoor unit's electrical service panel.
3. Document — Photograph every wire and terminal on the existing board before disconnecting.
4. Remove — Label and unplug each connector, release the board standoffs or mounting screws, and lift out the old board.
5. Install — Mount the new board on the standoffs and reconnect every wire to match your photos exactly.
6. Test — Restore power and verify the defrost cycle, compressor, and reversing valve operation.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts in heating mode.
• Compressor or reversing valve will not energize.
• System short cycles or behaves erratically between heat and cool.
• Visible burn marks, corrosion, or failed relays on the existing board.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.